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"Know Thy Enemy" is the 17th episode of the second season of The CW television series, The Vampire Diaries and the 39th episode of the series overall. It originally aired on April 7, 2011. The episode was written by Mike Daniels and directed by Wendey Stanzler.
Original Release
04/12/2011
Cast
| Name | Character |
|---|
| Nina Dobrev | Elena Gilbert / Katherine Pierce |
| Paul Wesley | Stefan Salvatore |
| Ian Somerhalder | Damon Salvatore |
| Steven R. McQueen | Jeremy Gilbert |
| Sara Canning | Jenna Sommers |
| Kat Graham | Bonnie Bennett |
| Candice King | Caroline Forbes |
| Zach Roerig | Matt Donovan |
| Michael Trevino | Tyler Lockwood |
| Matthew Davis | Alaric Saltzman |
Directors
Writers
L.J. Smith, Mike Daniels, Julie Plec, Kevin Williamson
Cast
| Name | Character |
|---|
| Nina Dobrev | Elena Gilbert / Katherine Pierce |
| Paul Wesley | Stefan Salvatore |
| Ian Somerhalder | Damon Salvatore |
| Steven R. McQueen | Jeremy Gilbert |
| Sara Canning | Jenna Sommers |
| Kat Graham | Bonnie Bennett |
| Candice King | Caroline Forbes |
| Zach Roerig | Matt Donovan |
| Michael Trevino | Tyler Lockwood |
| Matthew Davis | Alaric Saltzman |
| Mia Kirshner | Isobel Flemming |
| David Anders | John Gilbert |
| Marguerite MacIntyre | Sheriff Liz Forbes |
| Bryton James | Luka Martin |
| Gino Anthony Pesi | Maddox |
| Susan Walters | Carol Lockwood |
| Michael Roark | Cowboy |
| Tony D Sims | Student |
Producers
| Name | Role |
|---|
| Kevin Williamson | Executive Producer |
| Julie Plec | Executive Producer |
| Bob Levy | Executive Producer |
| Leslie Morgenstein | Executive Producer |
| John Behring | Producer |
| Elizabeth Craft | Producer |
| Mike Daniels | Producer |
| Caroline Dries | Producer |
| Sarah Fain | Producer |
| Aida Rodgers | Producer |
| James L. Thompson III | Producer |
| Pascal Verschooris | Producer |
